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Expired European patentEurope

Control plate for a gas discharge display device and method of making such a control plate

EP 0023357 B1 · Applicant: SIEMENS AKTIENGESELLSCHAFT

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed July 28, 1980 and granted March 14, 1984. A European patent lasts at most 20 years from filing, so its term ended July 28, 2000.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by January 28, 2006.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledJuly 28, 1980
PublishedFebruary 4, 1981
GrantedMarch 14, 1984
Term endedJuly 28, 2000
Application numberEP 80104435
Classification (CPC)H01J17/498

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedJuly 28, 1980PublishedFeb 4, 1981Patent grantedMarch 14, 1984Term endedJuly 28, 2000

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

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